Study on the Influence Mechanism of Inner Oil to the Impact Resistance of the Fixed-roof Storage Tank against the Explosion Blast Wave

摘要

The explosion blast wave in the chemical park will cause the domino effect and serious damage to the surrounding tanks. In order to study the influence mechanism of the inner oil on the impact resistance of the large-scale fixed-roof storage tank against the explosion blast wave, the finite element software LS-DYNA is used to establish finite element model of 5,000 m3 fixed-roof storage tank with inner oil height of 0m, 5 m, 10 m and 15 m, when the vertical height of the explosion point center to the ground is 0.4m, 5m, 10m, 15m, respectively. The failure process, the maximum displacement of tank wall, the total energy, kinetic energy and internal energy transformed from explosion are obtained by simulation and analysis. The results show: the failure process of the tank is mainly concave deformation and buckling deformation, no matter how the oil height changes. Stress concentration commonly occurs at the maximum displacement of the concave deformation and the plastic hinge lines produced by the buckling deformation; the maximum displacement of the tank wall is mainly affected by the relative vertical height between explosion point and oil; when the explosion point mass and the horizontal distance from the point to the nearby tank wall are constant, the total energy of the tank transformed from explosion is mainly affected by the oil height, and it is almost not affected by the change of the vertical height of the explosion point. And the maximum displacement of the tank wall is irrelevant with the total energy of the tank.